CN107222284A - A kind of fountain coding anti-eavesdropping transmission method in Internet of Things based on channel feedback - Google Patents
A kind of fountain coding anti-eavesdropping transmission method in Internet of Things based on channel feedback Download PDFInfo
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- CN107222284A CN107222284A CN201710625711.1A CN201710625711A CN107222284A CN 107222284 A CN107222284 A CN 107222284A CN 201710625711 A CN201710625711 A CN 201710625711A CN 107222284 A CN107222284 A CN 107222284A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/06—Secret communication by transmitting the information or elements thereof at unnatural speeds or in jumbled order or backwards
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- Data Exchanges In Wide-Area Networks (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
The invention discloses a kind of anti-eavesdropping transmission method of the fountain coding in Internet of Things based on channel feedback, comprise the following steps：In k-th of time slot, when legitimate receipt end Bob is properly received the coding bag of current time slots transmission, then then the raw data packets for selecting a legitimate receipt end Bob not decode are encoded, then the coding bag that the result of coding is sent as next time slot；Otherwise, then coding bag of the coding bag sent current time slots as next time slot；3) judge whether the raw data packets set U that legitimate receipt end Bob is not decoded is empty set, when the raw data packets set U that legitimate receipt end Bob is not decoded is not empty set, then go to step 2), when the raw data packets set U that legitimate receipt end Bob is not decoded is empty set, then legitimate receipt end Bob has been received by all raw data packets, legitimate receipt end Bob recovers source file according to all raw data packets are received, and the transmission method anti-eavesdropping can preferably, and security is higher.
Description
Technical field
The invention belongs to wireless communication technology field, it is related to the fountain coding based on channel feedback in a kind of Internet of Things anti-surreptitiously
Listen transmission method.
Background technology
In the past few years, developing rapidly and its extensive use with wireless communication technology, wireless network secure problem also by
Increasing concern is arrived.
At present, the main stream approach of traditional transmission that ensures safety is realized by encrypting, still, following numerous wireless
Business is ever-changing to the demand of safe class, and encryption method is also difficult to meet its demand.Compared with conventional encryption technique, physics
The basic thought of layer safe practice is to utilize wireless communication technology by various declines, noise and the disturbing factor in wireless channel
It is changed into the instrument of confrontation eavesdropping, so as to realize the safe transmission of physical layer.And from the perspective of application, also with easy reality
Now, the advantages of easy care.
Fountain coding applies more by its peculiar advantage in terms of data broadcasting and storage, but seldom transports it
Use on network security problem.It is feasible to be applied it to according to the fundamental characteristics of fountain codes in network security, as long as legal
Reception user can be accumulated to required fountain codes packet prior to listener-in can just ensure the security of transmission.Therefore, pin
The shortcoming and fountain coding for the method that ensured safety to tradition encode the feasible letter for the transmission that ensures safety in physical layer, and research is a kind of
The specific anti-eavesdropping safe transmission method of fountain coding is significant.
The content of the invention
It is an object of the invention to the shortcoming for overcoming above-mentioned prior art, there is provided channel feedback is based in a kind of Internet of Things
The anti-eavesdropping transmission method of fountain coding, the transmission method anti-eavesdropping can preferably, security is higher.
To reach the anti-eavesdropping transmission side of fountain coding in above-mentioned purpose, Internet of Things of the present invention based on channel feedback
Method comprises the following steps：
1) set communication system and include an a transmitting terminal Alice and legitimate receipt end Bob, and the wireless communication of communication system
Road uses rayleigh fading channel model, and source file is divided into K raw data packets by transmitting terminal Alice, and reselection is wherein any one
Individual raw data packets are wrapped as first coding, then retransmit the first coding bag chosen；
2) in k-th of time slot, transmitting terminal Alice determines legal connect by the legitimate receipt end Bob 1bit information fed back to
Whether receiving end Bob is properly received the coding bag of time slot transmission, when legitimate receipt end Bob is properly received current time slots transmission
During coding bag, then the raw data packets that a legitimate receipt end Bob is not decoded are selected according to importance and channel quality, it is then right
The raw data packets not decoded chosen are encoded, then the coding bag that the result of coding is sent as next time slot；
When legitimate receipt end Bob is not properly received the coding bag of current time slots transmission, then transmitting terminal Alice is sent in next time slot
Coding bag it is identical with the coding bag that current time slots are not properly received, meanwhile, transmitting terminal Alice is according to legitimate receipt end Bob
What 1bit information architecture legitimate receipts end the Bob decoded raw data packets set D and legitimate receipt end Bob of feedback were not decoded
Raw data packets set U；
3) judge whether the raw data packets set U that legitimate receipt end Bob is not decoded is empty set, as legitimate receipt end Bob
When the raw data packets set U not decoded is not empty set, then step 2 is gone to), the original number not decoded as legitimate receipt end Bob
During according to bag set U for empty set, then legitimate receipt end Bob has been received by all raw data packets, legitimate receipt end Bob according to
Receive all raw data packets and recover source file, complete the anti-eavesdropping fountain codes construction based on channel feedback.
Step 2) in the raw data packets not decoded that choose are encoded, then using the result of coding as next
What time slot was sent, which encodes the concrete operations wrapped, is：
When legitimate receipt end Bob receives transmitting terminal AliceThe coding bag t that time slot is sentiWhen, then transmitting terminal Alice
The coding bag t sent in i+1 time slotsi+1For：
Wherein, B is the XOR result for all raw data packets that legitimate receipt end Bob is decoded, sx+1∈ U, sx+1
The initial data not decoded according to the legitimate receipt end Bob that importance and channel quality choose for transmitting terminal Alice
Bag.
In the raw data packets set U that each time slot, transmitting terminal Alice are not decoded to legal receiving terminal Bob it is all not
The raw data packets of decoding are according to important factor imxIt is ranked up from big to small, wherein, U={ u1, u2, uc..., uL, ucFor c
The raw data packets that individual legitimate receipt end Bob is not decoded, when c is smaller, then ucIt is more important.
After the raw data packets set D decoded, legitimate receipt end Bob is received into raw data packets txWith not
Receive raw data packets txThe absolute value sum of the image corresponding points pixel value recovered respectively is as raw data packets tx
Important factor imx。
The raw data packets that a legitimate receipt end Bob is not decoded are selected according to importance and channel quality, wherein, channel
Quality is better, then corresponding raw data packets are more important, i.e., the probability that the raw data packets are selected is bigger.
When index c is bigger, then raw data packets ucThe probability being selected is bigger, wherein,
Wherein, L is the raw data packets number that legitimate receipt end Bob is not decoded, z0For default channel quality quality
Separation, z is the Real-time Channel gain between transmitting terminal Alice and legitimate receipt end Bob, z=| hAB|2AndD is the distance between transmitting terminal Alice and legitimate receipt end Bob, and α is transmission
The path loss between Alice and legitimate receipt end Bob is held, α is the constant more than 1.
The invention has the advantages that：
The anti-eavesdropping transmission method of fountain coding in Internet of Things of the present invention based on channel feedback in concrete operations,
In k-th of time slot, whether transmitting terminal Alice determines legitimate receipt end Bob by the legitimate receipt end Bob 1bit information fed back to
The coding bag of time slot transmission is properly received, when legitimate receipt end Bob is properly received the coding bag of current time slots transmission, then
Then the raw data packets not decoded chosen are entered by the raw data packets that one legitimate receipt end Bob of selection is not decoded
Row coding, then the coding bag that the result of coding is sent as next time slot, so as to effectively improve listener-in Eve error code
Rate, anti-eavesdropping can be excellent, and the security of information transfer is higher, meanwhile, when legitimate receipt end Bob is not properly received current
During the coding bag that gap is sent, then transmitting terminal Alice is not properly received in the coding bag that next time slot is sent with current time slots
Coding bag is identical, so that legitimate receipt end Bob can recover complete source file.
Further, after legitimate receipt end Bob receives the coding bag of a upper time slot, in time slot transmitting terminal Alice
The raw data packets XOR previous time slot legitimate receipt end that the coding bag that will be sent is not decoded by a legitimate receipt end Bob
All raw data packets at Bob decodings are obtained, as long as therefore listener-in Eve has a coding bag not connect during eavesdropping
Harvest work(, then it will be unable to decode the remaining raw data packets not decoded, so as to cause its eavesdropping failure.
Brief description of the drawings
Fig. 1 is system model figure of the present invention；
Fig. 2 carries the complexity comparison diagram of code construction method for existing method with the present invention；
Fig. 3 is existing method and the change curve of listener-in Eve intercept probabilities of the invention with raw data packets number K
Figure；
Fig. 4 a are artwork；
Fig. 4 b are the image that legitimate receipt end Bob is recovered；
Fig. 4 c are the image that listener-in Eve is stolen.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
With reference to Fig. 1, the anti-eavesdropping transmission method of fountain coding in Internet of Things of the present invention based on channel feedback includes
Following steps：
1) set communication system and include an a transmitting terminal Alice and legitimate receipt end Bob, and the wireless communication of communication system
Road uses rayleigh fading channel model, and source file is divided into K raw data packets by transmitting terminal Alice, and reselection is wherein any one
Individual raw data packets are wrapped as first coding, then retransmit the first coding bag chosen；
2) in k-th of time slot, transmitting terminal Alice determines legal connect by the legitimate receipt end Bob 1bit information fed back to
Whether receiving end Bob is properly received the coding bag of time slot transmission, when legitimate receipt end Bob is properly received current time slots transmission
During coding bag, then the raw data packets that a legitimate receipt end Bob is not decoded are selected according to importance and channel quality, it is then right
The raw data packets not decoded chosen are encoded, then the coding bag that the result of coding is sent as next time slot；
When legitimate receipt end Bob is not properly received the coding bag of current time slots transmission, then transmitting terminal Alice is sent in next time slot
Coding bag it is identical with the coding bag that current time slots are not properly received, meanwhile, transmitting terminal Alice is according to legitimate receipt end Bob
What 1bit information architecture legitimate receipts end the Bob decoded raw data packets set D and legitimate receipt end Bob of feedback were not decoded
Raw data packets set U；
3) judge whether the raw data packets set U that legitimate receipt end Bob is not decoded is empty set, as legitimate receipt end Bob
When the raw data packets set U not decoded is not empty set, then step 2 is gone to), the original number not decoded as legitimate receipt end Bob
During according to bag set U for empty set, then legitimate receipt end Bob has been received by all raw data packets, legitimate receipt end Bob according to
Receive all raw data packets and recover source file, complete the anti-eavesdropping fountain codes construction based on channel feedback.
Step 2) in the raw data packets not decoded that choose are encoded, then using the result of coding as next
What time slot was sent, which encodes the concrete operations wrapped, is：
When legitimate receipt end Bob receives transmitting terminal AliceThe coding bag t that time slot is sentiWhen, then transmitting terminal Alice
The coding bag t sent in i+1 time slotsi+1For：
Wherein, B is the XOR result for all raw data packets that legitimate receipt end Bob is decoded, sx+1∈ U, sx+1
The initial data not decoded according to the legitimate receipt end Bob that importance and channel quality choose for transmitting terminal Alice
Bag.
In the raw data packets set U that each time slot, transmitting terminal Alice are not decoded to legal receiving terminal Bob it is all not
The raw data packets of decoding are according to important factor imxIt is ranked up from big to small, wherein, U={ u1, u2, uc..., uL, ucFor c
The raw data packets that individual legitimate receipt end Bob is not decoded, when c is smaller, then ucIt is more important.
After the raw data packets set D decoded, legitimate receipt end Bob is received into raw data packets txWith not
Receive raw data packets txThe absolute value sum of the image corresponding points pixel value recovered respectively is as raw data packets tx
Important factor imx。
The raw data packets that a legitimate receipt end Bob is not decoded are selected according to importance and channel quality, wherein, channel
Quality is better, then corresponding raw data packets are more important, i.e., the probability that the raw data packets are selected is bigger.
When index c is bigger, then raw data packets ucThe probability being selected is bigger, wherein,
Wherein, L is the raw data packets number that legitimate receipt end Bob is not decoded, z0For default channel quality quality
Separation, z is the Real-time Channel gain between transmitting terminal Alice and legitimate receipt end Bob, z=| hAB|2AndD is the distance between transmitting terminal Alice and legitimate receipt end Bob, and α is transmission
The path loss between Alice and legitimate receipt end Bob is held, α is the constant more than 1.
With reference to Fig. 2, Fig. 2 abscissa represents simulation times, and ordinate represents to emulate the time that corresponding number of times is run, by
Fig. 2 is understood, in the case of simulated conditions identical, and the present invention has lower operation complexity, and more multiple than existing methods
About 19% or so (at n=100 times, t1=100.384s, t2=81.253s) of miscellaneous degree lifting, its reason is that the present invention is being compiled
Optimization during code construction to coding bag.
With reference to Fig. 3, from simulation result it can be found that the present invention is identical with the intercepting and capturing rate that currently existing scheme can reach, all
It is the increase with K, nearly exponential damping law is presented in listener-in Eve intercept probability.When K is larger, listener-in Eve can reach
To a low-down intercept probability.For example, Fig. 4 a, Fig. 4 b and Fig. 4 c are doing real image (220x220 gray-scale map) transmission
K=(220x220)/10=4840 during emulation, now listener-in Eve can from intercepting and capturing coding bag in recover few original number
According to bag.
It can be seen that from Fig. 4 a, Fig. 4 b and Fig. 4 c, can be realized and recovered without distortions at validated user using the present invention
While going out original image, the image fault that listener-in Eve goes out from the data packet recovery intercepted is huge, so as to reach safe biography
Defeated purpose.
Claims (6)
1. the anti-eavesdropping transmission method of fountain coding in a kind of Internet of Things based on channel feedback, it is characterised in that including following step
Suddenly：
1) communication system is set to adopt comprising an a transmitting terminal Alice and legitimate receipt end Bob, and the wireless channel of communication system
Rayleigh fading channel model is used, source file is divided into K raw data packets, reselection wherein any one original by transmitting terminal Alice
Beginning packet is wrapped as first coding, then retransmits the first coding bag chosen；
2) in k-th of time slot, transmitting terminal Alice determines legitimate receipt end by the legitimate receipt end Bob 1bit information fed back to
Whether Bob is properly received the coding bag of time slot transmission, when legitimate receipt end Bob is properly received the coding of current time slots transmission
Bao Shi, then select the raw data packets that a legitimate receipt end Bob is not decoded, then to selection according to importance and channel quality
The raw data packets not decoded out are encoded, then the coding bag that the result of coding is sent as next time slot；Work as conjunction
When method receiving terminal Bob is not properly received the coding bag of current time slots transmission, then the volume that transmitting terminal Alice is sent in next time slot
Code bag is identical with the coding bag that current time slots are not properly received, meanwhile, transmitting terminal Alice feeds back according to legitimate receipt end Bob
1bit information architecture legitimate receipts end Bob decoded raw data packets set D and legitimate receipt end Bob do not decode it is original
Packet set U；
3) judge whether the raw data packets set U that legitimate receipt end Bob is not decoded is empty set, and Bob is not solved when legitimate receipt end
When the raw data packets set U of code is not empty set, then step 2 is gone to), the raw data packets not decoded as legitimate receipt end Bob
When set U is empty set, then legitimate receipt end Bob has been received by all raw data packets, and legitimate receipt end Bob is according to reception
Source file is recovered to all raw data packets, the anti-eavesdropping fountain codes construction based on channel feedback is completed.
2. the anti-eavesdropping transmission method of fountain coding in Internet of Things according to claim 1 based on channel feedback, its feature
Be, step 2) in the raw data packets not decoded that choose are encoded, then regard the result of coding as lower a period of time
What gap was sent, which encodes the concrete operations wrapped, is：
When legitimate receipt end Bob receives the coding bag t that transmitting terminal Alice is sent in the i-th time slotiWhen, then transmitting terminal Alice is in i+1
The coding bag t that time slot is senti+1For：
<mrow>
<msub>
<mi>t</mi>
<mrow>
<mi>i</mi>
<mo>+</mo>
<mn>1</mn>
</mrow>
</msub>
<mo>=</mo>
<mi>B</mi>
<mo>&CirclePlus;</mo>
<msub>
<mi>s</mi>
<mrow>
<mi>x</mi>
<mo>+</mo>
<mn>1</mn>
</mrow>
</msub>
</mrow>
Wherein, B is the XOR result for all raw data packets that legitimate receipt end Bob is decoded, sx+1∈ U, sx+1For hair
The raw data packets that sending end Alice is not decoded according to the legitimate receipt end Bob that importance and channel quality choose.
3. the anti-eavesdropping transmission method of fountain coding in Internet of Things according to claim 1 based on channel feedback, its feature
It is, it is all in the raw data packets set U that each time slot, transmitting terminal Alice are not decoded to legal receiving terminal Bob not decode
Raw data packets according to important factor imxIt is ranked up from big to small, wherein, U={ u1, u2, uc..., uL, ucFor c-th of conjunction
The raw data packets that method receiving terminal Bob is not decoded, when c is smaller, then ucIt is more important.
4. the anti-eavesdropping transmission method of fountain coding in Internet of Things according to claim 3 based on channel feedback, its feature
It is, after the raw data packets set D decoded, legitimate receipt end Bob is received into raw data packets txWith not receiving
To raw data packets txThe absolute value sum of the image corresponding points pixel value recovered respectively is as raw data packets tx's
Important factor imx。
5. the anti-eavesdropping transmission method of fountain coding in Internet of Things according to claim 1 based on channel feedback, its feature
It is, the raw data packets that a legitimate receipt end Bob is not decoded is selected according to importance and channel quality, wherein, channel matter
Amount is better, then corresponding raw data packets are more important, i.e., the probability that the raw data packets are selected is bigger.
6. the anti-eavesdropping transmission method of fountain coding in Internet of Things according to claim 5 based on channel feedback, its feature
It is, when index c is bigger, then raw data packets ucThe probability being selected is bigger, wherein,
Wherein, L is the raw data packets number that legitimate receipt end Bob is not decoded, z0For the boundary of default channel quality quality
Point, z is the Real-time Channel gain between transmitting terminal Alice and legitimate receipt end Bob, z=| hAB|2Andσ2=d-α, d is the distance between transmitting terminal Alice and legitimate receipt end Bob, and α is transmitting terminal
Path loss between Alice and legitimate receipt end Bob, α is the constant more than 1.
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| CN108259138A (en) * | 2018-04-25 | 2018-07-06 | 中国人民解放军战略支援部队信息工程大学 | A kind of safe transmission method repeatedly fed back using fountain codes |
| CN108718225A (en) * | 2018-08-25 | 2018-10-30 | 中国人民解放军战略支援部队信息工程大学 | A kind of safe transmission method based on the interference of fountain codes key coded identification |
| CN109412750A (en) * | 2018-09-19 | 2019-03-01 | 西安交通大学 | Anti- eavesdropping transmission method based on fountain codes in a kind of multimedia communication |
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Effective date of registration: 20220215 Address after: 719000 room 908, Gaoke building, Kaiyuan Avenue, high tech Industrial Park, Yulin City, Shaanxi Province Patentee after: Shaanxi Ruiyuan Wutong Intelligent Technology Co.,Ltd. Address before: Beilin District Xianning West Road 710049, Shaanxi city of Xi'an province No. 28 Patentee before: XI'AN JIAOTONG University |